Perhaps you should try some spelling variations:
fundamental theories » fundamental theory, fundamental types
fundamental theorems » fundamental theory, fundamental problems
fundamental studies » fundamental solutions, fundamental solution

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((((((fundamental theories) OR (fundamental studies))) OR (fundamental symmetries))) OR (fundamental theorems))) OR (fundamental theorem)) of physics.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((fundamental theories) OR (fundamental studies))) or (fundamental symmetries))) or (fundamental theorems))) or (fundamental theorem)) of physics".
• Adding a wildcard symbol may retrieve word variants: ((((((((fundamental theories) OR (fundamental studies))) or (fundamental symmetries))) or (fundamental theorems))) or (fundamental theorem)) of physics*.